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Allowance for Loan Losses and Credit Quality of Loans, Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Contract	Mar. 31, 2018 USD ($) Contract
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	20	16
Pre-modification outstanding recorded investment	$ 1,235	$ 765
Post-modification outstanding recorded investment	$ 1,252	$ 855
Number of contracts | Contract	20	23
Recorded Investment	$ 1,015	$ 1,574
Commercial Loans [Member]
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	3	3
Pre-modification outstanding recorded investment	$ 453	$ 319
Post-modification outstanding recorded investment	$ 453	$ 410
Number of contracts | Contract	0	1
Recorded Investment	$ 0	$ 200
Commercial Loans [Member] | C&I [Member]
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	1	0
Pre-modification outstanding recorded investment	$ 65	$ 0
Post-modification outstanding recorded investment	$ 65	$ 0
Commercial Loans [Member] | Business Banking [Member]
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	2	3
Pre-modification outstanding recorded investment	$ 388	$ 319
Post-modification outstanding recorded investment	$ 388	$ 410
Number of contracts | Contract	0	1
Recorded Investment	$ 0	$ 200
Consumer Loans [Member]
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	11	8
Pre-modification outstanding recorded investment	$ 394	$ 123
Post-modification outstanding recorded investment	$ 394	$ 122
Number of contracts | Contract	12	14
Recorded Investment	$ 617	$ 870
Consumer Loans [Member] | Dealer Finance [Member]
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	5	6
Pre-modification outstanding recorded investment	$ 74	$ 82
Post-modification outstanding recorded investment	$ 74	$ 81
Number of contracts | Contract	2	0
Recorded Investment	$ 17	$ 0
Consumer Loans [Member] | Direct [Member]
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	6	2
Pre-modification outstanding recorded investment	$ 320	$ 41
Post-modification outstanding recorded investment	$ 320	$ 41
Number of contracts | Contract	10	14
Recorded Investment	$ 600	$ 870
Residential Real Estate [Member]
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	6	5
Pre-modification outstanding recorded investment	$ 388	$ 323
Post-modification outstanding recorded investment	$ 405	$ 323
Number of contracts | Contract	8	8
Recorded Investment	$ 398	$ 504

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Number of financing receivables that have been modified by troubled debt restructurings.

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